According to natural law theory, there exists an objective law of morality based in the nature of human society or human nature. Thus, natural law is inherently true, not a product of a mutable or subjective viewpoint. This fascinating and topical book probes the history and implications of natural law and surveys the ideas of thinkers such as Aristotle, Thomas Aquinas, and Immanuel Kant. The author analyzes the development of natural law from ancient times to the present. In addition, he discusses pressing moral issues (abortion, homosexuality, assisted suicide, and more) in light of natural law theory.